The KM Kelud is a passenger ferry. She belongs to the National Indonesian Shipping Company. A series of short cruises between Jakarta (Indonesia) and Medan (Indonesia) took place in July - September 2012. The cruise area included Java Sea and Strait of Malacca. One thousand one hundred seventy-six (1176) measurement series spanning 37 days were acquired during the cruise.
Mr. Yanto and Mr. Dany Prasetyo from PILA and Co (Jakarta, Indonesia) were Principal Investigators for optical depth measurements. Mr. Agung Jeldy Gumilar operated a sunphotometer onboard.